(http://curl.haxx.se/bug/view.cgi?id=1879375) which describes how libcurl
  got lost in this scenario: proxy tunnel (or HTTPS over proxy), ask to do any
  proxy authentication and the proxy replies with an auth (like NTLM) and then
  closes the connection after that initial informational response.

  libcurl would not properly re-initialize the connection to the proxy and
  continue the auth negotiation like supposed. It does now however, as it will
  now detect if one or more authentication methods were available and asked
  for, and will thus retry the connection and continue from there.

- I made the progress callback get called properly during proxy CONNECT.

did "SESS". Fixed now.

removed inclusion of libcurl memory debug headers since this lib stub is a well proofed method suggested by Novell. This enables usage of the stub with language bindings.

it when sys/poll.h is unavailable

that it is bad anyway. Starting now, removing a handle that is in used in a
pipeline will break the pipeline - it'll be set back up again but still...

status.  It uses Gtk+ to make a smooth pulse. Written by Jud Bishop

CONNECT over a proxy. curl_multi_fdset() didn't report back the socket
properly during that state, due to a missing case in the switch in the
multi_getsock() function.

curl_off_t and CURLOPT_POSTFIELDSIZE_LARGE is used to pass value to libcurl